[clang] [Clang] Support includes translated to module imports in -header-include-filtering=direct-per-file (PR #156756)

[Bob Wilson via cfe-commits]

https://github.com/bob-wilson commented:

I have reviewed these changes and they look OK to me. This is a new option and as far as I know, swift-build is the only thing using it. Sina has a change to update swift-build to work with the new format.

https://github.com/llvm/llvm-project/pull/156756